Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.0505l&link_type=abstract
American Astronomical Society, SPD meeting #42, #5.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The true nature of Coronal Bright Fronts (CBFs; commonly called "EIT Waves") remains enigmatic despite more than ten years of research. High cadence contemporaneous observations from the Solar Dynamic Observatory (SDO) and Solar TErrestrial RElations Observatory (STEREO) spacecraft are used here to determine the kinematics and dispersion of a CBF pulse observed on 2010 August 14. The CBF exhibited clear deceleration with propagation, with lower initial velocity and weaker deceleration in STEREO observations compared to SDO. The kinematics of the CBF were found to be highly passband dependent, with the pulse exhibiting higher initial velocity and stronger deceleration in cooler passbands. Significant pulse broadening was also measured using both STEREO ( 55 km/s) andSDO ( 65 km/s) observations. The dispersion rate of the pulse was derived by modeling the CBF as a linear superposition of sinusoidal waves within a Gaussian envelope. These results imply that the observed CBF is a fast-mode magnetoacoustic wave, and allowed the quiet coronal magnetic field strength to be estimated at 1-2 G.
DeLuca Edward E.
Gallagher Peter
Long David
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